
#ifndef _STRING_H
#define _STRING_H

#include <stddef.h>
const size_t strlen(const char* string); 
const size_t strnlen(const char* string, const size_t size); 
const size_t strnlen_terminator(const char* string, const size_t size, const char terminator); 

char* strcpy(char* dest, const char* src); 
char* strncpy(char* dest, const char* src, size_t n); 

const int strcmp(const char* str1, const char* str2); 
const int strncmp(const char* str1, const char* str2, const size_t n); 
const int istrcmp(const char* str1, const char* str2); 
const int istrncmp(const char* str1, const char* str2, const size_t n); 

const int to_numeric_digit(const char c); 
const int is_digit(const char c); 
#endif 